<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <script src=""></script>
    <title>作业</title>
    <style>
        body{
            background-color: gold;
        }
        h2{
            text-align: center;
        }
    </style>
</head>
<body>
<h2>Hello World</h2>
<script>

</script>
</body>
</html>